機器
brown
bucket
business
coal
construction
copper
cut
digging
dirt
electricity
energy
engineering
environment
environmental
equipment
europe
excavation
excavator
factory
fuel
germany
heavy
industrial
industry
infrastructure
iron
landscape
lignite
machinery
metal
mine
mining
open
openpit
pit
plant
pollution
power
production
raw
rock
sand
sky
supply
technology
transport
transportation
truck
wheel
定額
open mining and transportation of coal by open methodの素材 [FY31097795719]
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